From the Greek Λεανδρος (Leandros) which means "lion of a man" from Greek λεων (leon) "lion" and ανδρος (andros) "of a man".

Leandro

In Greek legend Leander was the lover of Hero. Every night he swam across the Hellespont to meet her, but on one occasion he was drowned when a storm arose. When Hero saw his dead body she threw herself into the waters and perished.